Príncipe
The island of Príncipe rises from the Gulf of Guinea as a heavily eroded volcano, its age speculated to be over three million years. It forms part of the Cameroon Line archipelago and reaches 947 metres at Pico do Príncipe in the south. Smaller islands surround it, including Ilheu Bom Bom, Ilhéu Caroço, Tinhosa Grande, and Tinhosa Pequena. Satellite images show the rugged terrain that defines this northern major island of São Tomé and Príncipe. The landmass covers an area of approximately 136 square kilometres, including offshore islets. This geological history shaped the physical topography that early explorers would later encounter.
Portuguese explorers discovered the uninhabited island on the 17th of January 1471 and initially named it Santo Antão after Saint Anthony. King John II of Portugal renamed it Príncipe in honour of his son Afonso, Hereditary Prince of Portugal, who lived between 1475 and 1491. The first settlement, the town of Santo António, was founded in 1502. A 1727 engraving described the harbour as very convenient for careening ships and noted the abundance of monkeys making the woods unsafe without a gun. The fortress Fortaleza de Santo António da Ponta da Mina was built in 1695 within Baía de Santo António. French forces destroyed both the city and the fortress in 1706. From 1753 until 1852, Santo António served as the colonial capital of Portuguese São Tomé and Príncipe.
Portuguese colonists established plantations across the north and centre of the island using forced labor systems. These operations initially focused on sugar production before shifting to cocoa cultivation after 1822. By that time, Príncipe had become the world's greatest producer of cocoa. In 1771, the population numbered 5,850 people, including 4,668 black slaves alongside 111 whites and 165 free mulattoes. When slavery was officially abolished in 1875, the population dropped sharply to only 1,946 individuals. Only 45 Europeans remained among the freed natives and freemen. Since independence, these exploitative plantations have largely reverted back to forest cover.
Arthur Stanley Eddington and his team conducted observations during the total solar eclipse of the 29th of May 1919. They used photographs from this event to test Albert Einstein's theory of general relativity. The images revealed evidence of starlight bending exactly as Einstein had predicted. This experimental corroboration took place on Príncipe and provided crucial support for the new physics framework. The success of these measurements transformed how scientists understood gravity and space-time curvature. It remains one of the most famous scientific expeditions ever undertaken on African soil.
On the 29th of April 1995, the Autonomous Region of Príncipe was established to correspond with the existing Pagué District. José Cassandra served as autonomous president from 2006 until 2020 after João Paulo Cassandra held the position between 2005 and 2006. Damião Vaz d'Almeida previously acted as Prime Minister of São Tomé and Príncipe before focusing on regional affairs. The island now contains only one town called Santo António alongside smaller settlements like Sundy and Porto Real. An airport with IATA code PCP serves the region today. Portuguese remains the official language while Principense or Lunguyê creole is also spoken by residents.
In 2006, Parque Natural Obô do Príncipe covered the mountainous southern part of the island where no humans live. This reserve protects numerous endemic species including the Principe scops owl, Príncipe kingfisher, and Príncipe seedeater. Other unique animals include the Príncipe starling, Príncipe sunbird, Dohrn's thrush-babbler, and Príncipe weaver. Geckos such as the Príncipe gecko and frogs like the palm forest tree frog inhabit these forests. Marine life includes Muricopsis principensis molluscs and West African mud turtles. UNESCO established the Island of Príncipe Biosphere Reserve in 2012 under its Man and the Biosphere Programme. The biosphere was extended to cover all of São Tomé in 2025 making it the first country entirely designated this way.
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Common questions
When was the island of Príncipe discovered by Portuguese explorers?
Portuguese explorers discovered the uninhabited island on the 17th of January 1471. They initially named it Santo Antão before King John II renamed it Príncipe in honour of his son Afonso.
What is the highest elevation point on the island of Príncipe?
The island reaches 947 metres at Pico do Príncipe located in the south. This peak represents the highest point within the heavily eroded volcanic landmass that covers approximately 136 square kilometres.
How did the total solar eclipse of 1919 affect science on the island of Príncipe?
Arthur Stanley Eddington and his team conducted observations during the total solar eclipse of the 29th of May 1919 to test Albert Einstein's theory of general relativity. The images revealed evidence of starlight bending exactly as predicted, providing crucial support for new physics frameworks.
Who served as autonomous president of the Autonomous Region of Príncipe from 2006 until 2020?
José Cassandra served as autonomous president from 2006 until 2020 after João Paulo Cassandra held the position between 2005 and 2006. Damião Vaz d'Almeida previously acted as Prime Minister before focusing on regional affairs.
When was the Island of Príncipe Biosphere Reserve established by UNESCO?
UNESCO established the Island of Príncipe Biosphere Reserve in 2012 under its Man and the Biosphere Programme. The biosphere was extended to cover all of São Tomé in 2025 making it the first country entirely designated this way.